You asked

Is the 7artisans af 18mm f 2 sharp wide open?

I don't have sharpness test results for the 7Artisans AF 18mm f/2, so I can't tell you how sharp it is wide open. What I can tell you is that it's an autofocus prime for APS-C cameras, with Sony E mount and no stabilisation. On an APS-C body it frames roughly like a 27mm lens on full frame.

If you're deciding whether f/2 is useful for you, the lens page has the full specs and a list of compatible cameras. For what the aperture does to exposure and background blur, see the lenses guide. Sample images or reviews from elsewhere will tell you more about edge sharpness at f/2 than I can here.

Written by Claude from this site's pages.

From these pages